linux-kernel - [PATCH AUTOSEL 4.19 6/8] ASoC: wm8998: Fix event generation for input mux

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Message-Id: <20220720011810.1025308-6-sashal@kernel.org>
Date:   Tue, 19 Jul 2022 21:18:08 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, lgirdwood@...il.com,
        perex@...ex.cz, tiwai@...e.com, patches@...nsource.cirrus.com,
        alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 4.19 6/8] ASoC: wm8998: Fix event generation for input mux

From: Charles Keepax <ckeepax@...nsource.cirrus.com>

[ Upstream commit 15b2e5d10ccf32a1a1ae7c636511e2f51320fdb5 ]

wm8998_inmux_put returns the value of snd_soc_dapm_mux_update_power,
which returns a 1 if a path was found for the kcontrol. This is
obviously different to the expected return a 1 if the control
was updated value. This results in spurious notifications to
user-space. Update the handling to only return a 1 when the value is
changed.

Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
Link: https://lore.kernel.org/r/20220628153409.3266932-2-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/codecs/wm8998.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/sound/soc/codecs/wm8998.c b/sound/soc/codecs/wm8998.c
index 17dc5780ab68..3b278435b0aa 100644
--- a/sound/soc/codecs/wm8998.c
+++ b/sound/soc/codecs/wm8998.c
@@ -111,6 +111,7 @@ static int wm8998_inmux_put(struct snd_kcontrol *kcontrol,
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	unsigned int mode_reg, mode_index;
 	unsigned int mux, inmode, src_val, mode_val;
+	int change, ret;
 
 	mux = ucontrol->value.enumerated.item[0];
 	if (mux > 1)
@@ -140,14 +141,20 @@ static int wm8998_inmux_put(struct snd_kcontrol *kcontrol,
 	snd_soc_component_update_bits(component, mode_reg,
 				      ARIZONA_IN1_MODE_MASK, mode_val);
 
-	snd_soc_component_update_bits(component, e->reg,
-				      ARIZONA_IN1L_SRC_MASK |
-				      ARIZONA_IN1L_SRC_SE_MASK,
-				      src_val);
+	change = snd_soc_component_update_bits(component, e->reg,
+					       ARIZONA_IN1L_SRC_MASK |
+					       ARIZONA_IN1L_SRC_SE_MASK,
+					       src_val);
 
-	return snd_soc_dapm_mux_update_power(dapm, kcontrol,
-					     ucontrol->value.enumerated.item[0],
-					     e, NULL);
+	ret = snd_soc_dapm_mux_update_power(dapm, kcontrol,
+					    ucontrol->value.enumerated.item[0],
+					    e, NULL);
+	if (ret < 0) {
+		dev_err(arizona->dev, "Failed to update demux power state: %d\n", ret);
+		return ret;
+	}
+
+	return change;
 }
 
 static const char * const wm8998_inmux_texts[] = {
-- 
2.35.1